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K
koenv76640897
Participant
July 8, 2015
Question

Help needed pausing and resuming a wiggle expression

  • July 8, 2015
  • 2 replies
  • 3880 views

Hi!

I would like to create something but I don't know how to do that. Hopefully someone can help me out.

I am animating a kind of northern light effect with particles and a wiggle expression. At a certain point in time, I want to pause the wiggle effect and make some manual position changes (like a path that the light follows). After a couple of seconds I want to resume the wiggle effect again.

I found some posts about starting and stopping the wiggle effect, but not much on pausing and resuming. Any ideas?

With kind regards,

Koen

This topic has been closed for replies.

2 replies

M
manjunathk23388540
Known Participant
August 22, 2015

https://drive.google.com/open?id=0B8GDTmMJgYovVWpGWGVkRDRHQXM

Just apply Above Animation Preset to your wiggle layer and animate Amplitude and frequency in Effects section.

Mathias Moehl
Community Expert
Mathias MoehlCommunity Expert
Community Expert
July 8, 2015

What is the difference between starting and stopping vs. starting, stopping and resuming again? It is just starting and stopping it several times.

You can link the wiggle amplitude to a slider and keyframe this slider to 0 wherever the wiggle should not wiggle.

You can do the same with iExpressions, as shown in this tutorial.

getting_started_with_iexpressions_part1_wiggles.jpg?itok=_MN8L5AY

Getting started with iExpressions Part 1 - Wiggles | mamoworld

One convenient and generic way of doing it is using Expression Timeline.

expression_timeline_2.png

PS: If you want to stop the wiggle abruptly and want to continue the motion path exactly where the wiggle stopped, it is probably best to simply do this with an extra keyframe (i.e. make the position keyframe "jump" from its original position to the position where the wiggle ended)

Mathias Möhl - Developer of tools like BeatEdit and Automation Blocks for Premiere Pro and After Effects
K
koenv76640897Author
Participant
July 8, 2015

Well, I suppose that's pretty much the effect I am trying to get, but I don't know if it's possible to apply the same start/stop code multiple times in one layer. It hasn't worked for me so far.

Thanks for the other suggestion tho, I'm gonna try them later!

Regards,

Koen

Dan Ebberts
Community Expert
Dan EbbertsCommunity Expert
Community Expert
July 8, 2015

Sometimes the trick with pausing and resuming a wiggle is to get it to hold the last value during the pause and resume from that value. If that's what you're after, this example is controlled by a checkbox, and it may do what you want:

ctrl = effect("Checkbox Control")("Checkbox");

n = ctrl.numKeys;

if (n > 0 && ctrl.key(1).time < time){

  accum = ctrl.key(1).value*(ctrl.key(1).time - inPoint);

  for (i = 2; i <= n; i++){

    if (ctrl.key(i).time > time) break;

    k1 = ctrl.key(i-1);

    k2 = ctrl.key(i);

    v2 = ctrl.valueAtTime(k2.time-.001);

    accum += (k1.value + v2)*(k2.time - k1.time)/2;

  }

  accum += (ctrl.value + ctrl.key(i-1).value)*(time - ctrl.key(i-1).time)/2;

}else{

  accum = ctrl.value*(time - inPoint);

}

wiggle(1,100,1,.5,accum)

Dan

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